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Apply llvm fix for possible hangs with CPUTYPE=skylake-avx512

Description

Apply llvm fix for possible hangs with CPUTYPE=skylake-avx512

Merge commit e8305c0b8f49 from llvm git (by Simon Pilgrim)

[X86] combineX86ShuffleChain - don't fold to truncate(concat(V1,V2)) if it was already a PACK op

Fixes #55050

PR: 264394
Reported by: VVD <vvd@unislabs.com>
MFC after: 3 days

(cherry picked from commit 592e876a422960a78938caa714f2263ff38eb87b)

Details

Provenance
dimAuthored on Jun 1 2022, 9:43 PM
Parents
rG2699604d8eae: libc: Add HISTORY sections to the manual pages
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